Malicious PDF — malware analysis report

Static analysis result for SHA-256 13cb863f764b786c…

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 08:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e9ad08d6e091083af53b61114f1110a1 SHA-1: 064789b4243b6fd50475f17d8f8ffe22a7bee3e9 SHA-256: 13cb863f764b786c491858f6810c509feadda522a809f274789fb92acce15ca9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external, untrusted content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://eownauto.com/uploadpic/files/44075747140.pdf In PDF document text
    • https://la-klamm.org/Files/files/ratapuguw.pdfIn PDF document text
    • http://kd-council.com/upfile/files/28676301336.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/2bd3791e43f67f328a8c8180c1c5b6cb/mewurokavopozidatakug.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/vizidusodebafibedesujid.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ffca2bafc---65421724209.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/zunal.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__61312BF0BF65E.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/32030134091.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/rataxavuxalefalivalelatek.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/8168469883.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/gebisusop.pdfIn PDF document text
    • http://nfc.soo.jp/file/zejibasijubikofoziso.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/lokigober.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/69794458392.pdfIn PDF document text
    • http://synphabase.ch/upload/file/74672358984.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/fivosaluroxi.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/25151752212.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/51470372927.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/37455735529.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/fulixotesezixamekikuredar.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///85746924120.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370b56294ac---powiwekefudisotuzevo.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/96518566857.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/lamonoxolotatonemaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=rap+fame+mod+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF050 10188 bytes
SHA-256: e764c6fdae36c61339a42dd63c44876ae6926f04194b2d53ace8bc1b00219a2d
font_02_sfnt_off00010726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10726 19860 bytes
SHA-256: 87282be4861e5f91a16d11850dbad1c0a753a78b92ef4f23e72ac5d490840ee7

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